Custom Exception Class in Java: Explanation & Practice

Problem summary

Create an InsufficientFundsException and throw it when withdrawal exceeds balance.

Starter code

// Create InsufficientFundsException class
// Throw when withdrawAmount > balance

public class Main {
    public static void main(String[] args) {
        double balance = 100;
        double withdraw = 150; // Test case 1
        
        // Try to withdraw, handle custom exception
    }
}

Expected output and test cases

• Insufficient balance

  Error: Insufficient funds. Need 50.0 more

• Valid withdrawal

  Withdrawal successful. Balance: 50.0

• Large overdraft

  Error: Insufficient funds. Need 400.0 more

Hints

1. Extend Exception class
2. Add custom fields for details
3. Override getMessage() if needed

Related Exception Handling exercises

• Practice Using Throws Clause in Java
• Practice Try-With-Resources in Java
• Practice Input Validation with Exceptions in Java

Practice all Exception Handling exercises · Run this idea in the Java compiler